An experiment was conducted to assess the effects of different levels of wet extruded full fat soybean (EFFSB) on measurements of the chickens small intestinal mucosa. A batch of Full-fat soybean (FFSB), were wet extruded at high temperature-short time (155°C, 15 seconds) in an extruder system. One hundred and ninety two d-old Ross 308 male broiler chicks were randomly allocated to 4 diets with 4 replicates of 12 birds each. The EFFSB was used at the rate of 0, 75, 150 and 225 g/kg in isocaloric and isonitrogenous starter, grower and finisher diets. On day 21, one bird from each replicate was slaughtered and morphometric indices of small intestine were measured. Results showed that although in jejunum, the main absorption site, villi length, villi width, villi surface area and crypt depth were similar in all birds fed different levels of EFFSB in diet, but in duodenum, villi length of control birds was significantly (P<0.05) higher than those fed diet contained high level of EFFSB (1313.3 µm vs. 833.2 µm) which caused to extended villi surface area for nutrients absorption in control birds. Also the muscular layer width of control birds was significantly (P<0.05) higher than those fed diet contained high level of EFFSB.

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